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TC2185-3.3VCTTR Datenblatt(PDF) 9 Page - Microchip Technology |
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TC2185-3.3VCTTR Datenblatt(HTML) 9 Page - Microchip Technology |
9 / 20 page © 2006 Microchip Technology Inc. DS21662E-page 9 TC2014/2015/2185 3.0 PIN DESCRIPTIONS The descriptions of the pins are described in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Unregulated Supply Input (VIN) Connect the unregulated input supply to the VIN pin. If there is a large distance between the input supply and the LDO regulator, some input capacitance is neces- sary for proper operation. A 1 µF capacitor, connected from VIN to ground, is recommended for most applications. 3.2 Ground Terminal (GND) Connect the unregulated input supply ground return to GND. Also connect one side of the 1 µF typical input decoupling capacitor close to this pin and one side of the output capacitor COUT to this pin. 3.3 Shutdown Control Input (SHDN) The regulator is fully enabled when a logic-high is applied to SHDN. The regulator enters shutdown when a logic-low is applied to this input. During shutdown, the output voltage falls to zero and the supply current is reduced to 0.5 µA (max). 3.4 Reference Bypass Input (Bypass) Connecting a low-value ceramic capacitor to Bypass will further reduce output voltage noise and improve the Power Supply Ripple Rejection (PSRR) performance of the LDO. Typical values from 470 pF to 0.01 µF are suggested. While smaller and larger values can be used, these affect the speed at which the LDO output voltage rises when input power is applied. The larger the bypass capacitor, the slower the output voltage will rise. 3.5 Regulated Voltage Output (VOUT) Connect the output load to VOUT of the LDO. Also con- nect one side of the LDO output de-coupling capacitor as close as possible to the VOUT pin. Pin No. Symbol Description 1VIN Unregulated supply input 2 GND Ground terminal 3 SHDN Shutdown control input 4 Bypass Reference bypass input 5VOUT Regulated voltage output |
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